Vibrator



June 18, 1929. "r, H, FISHER' 1,717,501

VIBRATOR Filed Dec. 17, 1924 \Wola Y. wenof! Patented June 18, 1929.

UNITED STATES PATENT GFFCE.

THOMAS H. FISHER, OF VINNETKA, ILLINOIS.

VIBRATOR.

This invention relatos to electrically operated vibrators and has for its principal obj ect to produce a simple, e'liicient and durable device o't the class described in which the axial dimensions of the device may be reduced to a minimum commensurate with the size ot the electric motor utilized therein.

As heretofore coi'istructed electric vibrators oiC relatively light type adapted for manual use have had as their main elements a small electric motor and an eccentric oscillating member operatively connected at one end et the motor armature. This arrangement oit the motor armature and oscillator member in alinement with each other requires a relatively long casing and consequently provides a more or less cumbersome and unwieldy device when being manipulated by hand.

In the present invention l overcome these 'disadvantages by provi-ding a hollow armature having the oscillator member housed within the armature and thereby reducing the necessary axial length of the entire device. My invention may best be understood by reference to the accompanying drawings, in which Figure 1 is a view in part longitudinal section ot a vibrator constructed in accordance with my invention.

Figure 2 is an enlarged sectional View taken on line 2 2 of Figure 1.

Referring now to details of the invention illustrated in the drawings, the vibrator is provided with a main casing 10 and a handle 11. A rotary electric motor 12 within the casing comprises the usual type ot field winding 13 and armature 14 having a commutator 15. The center portion of the armature comprises a hollow tube 16 closed at one end by a. plate 17 which in the form shown is made integral with the tube 16. The entire arinature and tube 1G are atlorded suitable beariu g in the casing, as 'tor instance by ball bearings 18 and 19 at opposite sides of the casing.

he oscillator device is housed substantially within the hollow portion ot the armature and comprises an oscillating' shaft 2O having its upper end 21 engaging in a hole 22 arranged ecccntrically of the end plate 17. The other end of the shaft is secured in place by a ball and socket `ioint indicated generally at adja this peu end ci the tube 16 and the casing.

ln order to prevent rotation or the shaft 20, a pair ol' pins 80, 30 are provided on opposite sides of the ball 26, these pins fitting in slots Il, on opposite sides of the socket memr in applicator.' device may be detachably connected in the usual manner to the outer end olZ the shalt 20. In the form, shown. a rubber cup el() is used. A cover plate l1 cncloses the upper end ot' the casing. The electric wires are not shown, as they may be arranged in any suitable manner :tor connection with the motor.

A vibrator device constructed as above described, is manifestly ot' simple construction with. a minimum number of moving parts and requiring a minimum longitudinal space substantially controlled by the longitudinal length of the motor employed. lVith these advantages, it is particularly adapted 'for manual use being relatively light and well balanced for the purpose to which it is usually applied.

I claim as my invention:

1. In a vibrator, a motor having a hollow armature carrying windings thereabout. a. vibrator shaft within said armature and windings, and connected eccentrically adjacent one end thereof and supported i'or vibratory movement adjacent the other end of said armature.

2. In a vibrator, the combination of a Inotor having a hollow arinature, and a gyrating shatt extendiu g longitudinally of said armature and 'from one end thereof, said shalt havin bearing adjacent its projecting end at a point coaxial with said armature and having bearing at the other end ot said armature eccentrically with respect to the axis thereof.

3. In a vibrator, a riotor casing and a motor therein, the motor having an armature provided with a hollow sleeve arranged longitudii'ially thereof and having bearings at opposite ends in said motor casing, and a gj,"- rating member having bearing within the longitudinal limits of seid hollow sleeve at points spaced longitudinally'o said sleeve and ollset with respect to each other.

4. In a vibrator7 a motor casing and a m0- tor therein7 the inotor having an armature provided with a. hollow sleeve arranged longitudinally thereof and having bearings at opposite ends in said motor casing, and a gyrating member having bearing within the longitudinal limits of said hollow sleeve at points spaced longitudinally of said sleeve, one of said hearing points being radially O- ser*J from and the other being coincidentJ with, the a-Xis of said armature.

Signed at Chicago, lll., this 12th day of December, 1924.

THOMAS H. FSHER. 

